1 files changed, 46 insertions, 0 deletions
diff --git a/dom/media/webaudio/AudioNodeExternalInputTrack.h b/dom/media/webaudio/AudioNodeExternalInputTrack.h
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index 0000000000..f273fee696
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+++ b/dom/media/webaudio/AudioNodeExternalInputTrack.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MOZILLA_AUDIONODEEXTERNALINPUTTRACK_H_
+#define MOZILLA_AUDIONODEEXTERNALINPUTTRACK_H_
+
+#include "MediaTrackGraph.h"
+#include "AudioNodeTrack.h"
+#include "mozilla/Atomics.h"
+
+namespace mozilla {
+
+class AbstractThread;
+
+/**
+ * This is a MediaTrack implementation that acts for a Web Audio node but
+ * unlike other AudioNodeTracks, supports any kind of MediaTrack as an
+ * input --- handling any number of audio tracks and handling blocking of
+ * the input MediaTrack.
+ */
+class AudioNodeExternalInputTrack final : public AudioNodeTrack {
+ public:
+  static already_AddRefed<AudioNodeExternalInputTrack> Create(
+      MediaTrackGraph* aGraph, AudioNodeEngine* aEngine);
+
+ protected:
+  AudioNodeExternalInputTrack(AudioNodeEngine* aEngine, TrackRate aSampleRate);
+  ~AudioNodeExternalInputTrack();
+
+ public:
+  void ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags) override;
+
+ private:
+  /**
+   * Determines if this is enabled or not.  Disabled nodes produce silence.
+   * This node becomes disabled if the document principal does not subsume the
+   * DOMMediaStream principal.
+   */
+  bool IsEnabled();
+};
+
+}  // namespace mozilla
+
+#endif /* MOZILLA_AUDIONODEEXTERNALINPUTTRACK_H_ */